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Effect of microplastics treated with heavy metals on physiological and biochemical stress parameters in duckweed (Lemna minor)
Summary
Researchers investigated the effects of heavy metal-treated microplastics (a mixture of polyethylene, polypropylene, and polystyrene) on physiological and biochemical stress parameters in marine organisms, finding that metal-contaminated microplastics altered stress responses compared to untreated plastic particles. The study highlights how abiotic weathering of microplastics can increase their ecotoxicological hazard through metal co-contamination.
Mikroplastika (MP) je kompleksno onečišćivalo te je sveprisutna u morskim, slatkovodnim i kopnenim ekosustavima. Pod utjecajem abiotičkih i biotičkih čimbenika njezina se svojstva mijenjaju, a time i potencijalna toksičnost za okoliš. U ovom radu je istražen utjecaj čiste MP (smjesa polietilena, polistirena, polipropilena i gume), kao i MP tretirane smjesom teških metala (olovo, cink i bakar) na vodenu leću (Lemna minor L.) putem Lemna testa i različitih fizioloških i biokemijskih pokazatelja stresa (sadržaj fotosintetskih pigmenata, karbonila i malondialdehida, te aktivnost antioksidacijskih enzima). Rezultati su pokazali da dolazi do otpuštanja metala s površine MP u hranjivu podlogu. Utvrđeno je nakupljanje Zn i Cu u vodenoj leći izloženoj najvećoj koncentraciji MP. Sedmodnevno izlaganje vodene leće česticama čiste MP ili MP s adsorbiranim metalima nije bitno utjecalo na rast vodene leće, izuzev čiste MP u koncentraciji 100 i 1000 čestica/L. Mikroplastika je izazvala promjene u aktivnosti antioksidacijskih enzima, no nije utvrđena lipidna peroksidacija ni oksidacijsko oštećenje proteina. Zamijećena je jača adsorpcija čestica MP (uglavnom polipropilena) na listićima vodene leće. Na temelju dobivenih rezultata može se zaključiti da je vodena leća pogodna za fitoremedijaciju čestica MP.
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